An intelligent combination of form and function, our highly versatile and market-leading Bi-fold sliding door system gives you maximum control over the style and operation of the doors.

Versatile and flexible, the market leading BSF70 aluminium folding door system is available in a wide range of configurations to create the look you desire. Multiple doors can be combined with open-in or open-out options, in a variety of styles to create a wide expanse of opening. The narrow profile ensures that maximum glazing is achieved, flooding rooms with light.

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Welcoming, stunning, practical.

Multiple panels can be added to accommodate the design specifications of your building, with the option to open in or out as required. The system also boasts a unique flush line pop-out handle that allows for square flush stacking panels when doors are fully open.

Design Features

  • Certified under the Secured By Design scheme
  • Tested to PAS 24
  • Unique, pop-out handle that allows for maximum door opening and panels to stack square
  • Four stainless style rollers to ensure smooth and consistent operation


  • Chamfered and square bead options
  • Glazing 28mm – 40mm
  • Available in a range of opening configurations
  • Available with heavy duty rollers; BSF70 HD
  • Available in a range of single or dual colour and anodised finishes


U value W/m²K (Double glazing) 1.6 W/m²K
U value W/m²K (Triple glazing) 1.4 W/m²K
Air tightness (Pa) Class 4 (600 Pa)
Water tightness (Pa) Class 9a (600 Pa)
Wind load (Pa) Class AE2400 (2400 Pa)
Certifications Q-mark
Air permeability Class 4 (600 Pa)
Water resistance Class 9a (600 Pa)
Security PAS 24 Yes
Dual color option Yes
Multi-point locking Yes
Glazing options Internal bead

Size Limits

Max Vent Weight 100 kg
Sightline (Head) 110mm
Sightline (Cill) 130mm
Sightline (Jamb) 110mm
Sightline (Meeting Stile) 140mm
Max sash width (mm) 1200
Max sash height (mm) 2400
Frame dimension 70 mm
Glazing thickness 24mm – 40mm

Ultion Lock as standard

The Ultion lock has an incredible suite of security features that work to secure your home against major attacks on your door.

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